Post Alarm Systems

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Post Alarm Systems Family-owned since 1956. Trusted security solutions in Southern California for 3 generations. Locally operated. Protection Your Way.

Founded in 1956 by retired police chief Sam Post, Post Alarm has been a trusted name in Southern California for home security and commercial security for three generations. With an approach that blends local expertise with leading technology, we deliver best-in-class security solutions including burglar alarm monitoring, video surveillance, live video monitoring, patrol and armed response services, fire alarm monitoring, and more. We pride ourselves on delivering customized security solutions, professional installation and service, and exceptional customer service. Contact us to experience the difference that nearly 70 years of security company expertise can make for you peace of mind. Trust Post Alarm to protect what matters most to you.

Porch pirates don't take a day off, and with holiday shopping season already in full swing, your doorstep is about to ge...
10/20/2026

Porch pirates don't take a day off, and with holiday shopping season already in full swing, your doorstep is about to get a lot busier. 📦

Last year, an estimated 104.3 million packages were stolen across the U.S., costing consumers about $15 billion.

Front-door video cameras keep watch over your front door, mobile alerts let you know the moment someone steps onto your porch, and live monitoring means real people are ready to respond when something doesn't look right. Protect your porch before the holiday rush.

Not your average company car. 🚨😎 Throwback to this vintage beauty sporting the Post Alarm name in style.
10/15/2026

Not your average company car. 🚨😎 Throwback to this vintage beauty sporting the Post Alarm name in style.

When your alarm goes off, every minute counts. 🚨If one company monitors your alarm and another handles patrol, that hand...
10/13/2026

When your alarm goes off, every minute counts. 🚨

If one company monitors your alarm and another handles patrol, that handoff can add 5–7 minutes before help arrives. With Post Alarm, monitoring and armed patrol work as one team, dispatched from our own local station, so officers are on the way the moment your alarm triggers. Because real security isn't just knowing something's wrong. It's having someone on standby to answer the call.

Fall is one of the busiest times of year for home closings, so if you just got the keys, you're not alone. Before you un...
10/08/2026

Fall is one of the busiest times of year for home closings, so if you just got the keys, you're not alone.

Before you unpack, make sure your new home is secure with this simple checklist. 🏡🔐

Over the past few months, the headlines out of LA's hillside neighborhoods have started to look alike: repeat burglaries...
10/06/2026

Over the past few months, the headlines out of LA's hillside neighborhoods have started to look alike: repeat burglaries at a home in July, a prowler at a property in August, an armed intruder in September, and just last weekend, three masked people trying to get into the home of actress before fleeing when she spotted them on camera.

The pattern is consistent. Crews strike at night, work in groups, and target secluded homes tucked away from busy streets. They're looking for easy entry and no one watching.

That's why one layer isn't enough. Cameras show you what's happening, sensors catch entry attempts at doors and windows, alarms announce that the home is protected, and 24/7 professional monitoring makes sure help is on the way even if you're asleep or away. Each layer covers what the others miss.

Burglars are counting on a gap in your defenses. Post Alarm makes sure there isn't one. Call (800) 654-7678 to book your free home security assessment.

A burglary happens in the U.S. every 26 seconds, yet many people still think it won't happen to them. Here are three of ...
09/25/2026

A burglary happens in the U.S. every 26 seconds, yet many people still think it won't happen to them. Here are three of the most common home security myths, and the facts behind them. ⤵️

Last Wednesday just before 4 a.m., three men in a white BMW stole a catalytic converter from a Prius in in about four ...
09/24/2026

Last Wednesday just before 4 a.m., three men in a white BMW stole a catalytic converter from a Prius in in about four minutes. A neighbor's camera recorded it all, but by the time anyone saw the footage, they were gone.

With layered security, that night could end differently. Cameras spot them the moment they pull up. Live monitoring agents see it happening in real time and call it in. Patrol responds while they're still at the scene of the crime.

A camera tells you what happened. Layered security helps stop it. If you're ready to layer your security, call us today for a free consultation: (800) 654-7678!

New school year, new gaps in your home security.🏠️Empty houses, predictable schedules, kids racing in the door; fall rou...
09/16/2026

New school year, new gaps in your home security.🏠️

Empty houses, predictable schedules, kids racing in the door; fall routines open up more than you'd think. A few small habits close most of it. Heres how you can close the gaps.

If you see this sign in your yard, you're in good company. ❤️🏠️
09/11/2026

If you see this sign in your yard, you're in good company. ❤️🏠️

Happy from all of us at Post Alarm!Today we're honoring the hardworking men and women who keep our communities safe an...
09/07/2026

Happy from all of us at Post Alarm!

Today we're honoring the hardworking men and women who keep our communities safe and running — including our own patrol and security team, who show up rain or shine to protect what matters most. Enjoy the holiday with the people you love.🧡

Address

47 East Saint Joseph Street
Arcadia, CA
91006

Opening Hours

Monday 9am - 5pm
Tuesday 9am - 5pm
Wednesday 9am - 5pm
Thursday 9am - 5pm
Friday 9am - 5pm

Telephone

8006547678

Website

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